#include<stdio.h>
int main() {
    int w, b, s;
    scanf("%d %d %d",&w,&b &s);
    if(s == 0) printf("Account inactive\n");
    else if (w > b) printf("Insuficient Balance\n");
    else printf("%.2f\n",(double)b - w);
    return 0;
}